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參數(shù)資料
型號(hào): W83877TF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)及接口
英文描述: Multi-Function I/O Port Controller(用于個(gè)人計(jì)算機(jī)的多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數(shù): 45/154頁
文件大小: 821K
代理商: W83877TF
W83877TF
Publication Release Date: March 1998
- 35 -
Version 0.61
2.2.7 FIFO Register (R/W base address + 5)
The Data Register consists of four status registers in a stack with only one register presented to the
data bus at a time. This register stores data, commands, and parameters and provides diskette-drive
status information. Data bytes are passed through the data register to program or obtain results after
a command. In the W83877TF, this register defaults to FIFO disabled mode after reset. The FIFO
can change its value and enable its operation through the CONFIGURE command.
Status Register 0 (ST0)
7-6
5
4
3
2
1-0
US1, US0 Drive Select:
00 Drive A selected
01 Drive B selected
10 Drive C selected
11 Drive D selected
HD Head address:
1 Head selected
0 Head selected
NR Not Ready:
1 Drive is not ready
0 Drive is ready
EC Equipment Check:
1 When a fault signal is received from the FDD or the track
0 signal fails to occur after 77 step pulses
0 No error
SE Seek end:
1 seek end
0 seek error
IC Interrupt Code:
00 Normal termination of command
01 Abnormal termination of command
10 Invalid command issue
11 Abnormal termination because the ready signal from FDD changed state during command execution
Status Register 1 (ST1)
Missing Address Mark. 1 When the FDC cannot detect the data address mark
or the data address mark has been deleted.
NW (Not Writable). 1 If a write Protect signal is detected from the diskette drive during
execution of write data.
ND (No DATA). 1 If specified sector cannot be found during execution of a read, write or verifly data.
Not used. This bit is always 0.
OR (Over Rum). 1 If the FDC is not serviced by the host system within a certain time interval during data transfer.
DE (data Error).1 When the FDC detects a CRC error in either the ID field or the data field.
Not used. This bit is always 0.
EN (End of track). 1 When the FDC tries to access a sector beyond the final sector of a cylinder.
0
1
2
3
4
5
6
7
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